Rocket attacks hit Istanbul police station and ruling Justice and Development (AK) Party's local headquarters on Friday, APA reports quoting Anadolu Agency.
Unidentified assailants first targeted police headquarters and hours later a second attack hit AK Party’s provincial headquarters.
Istanbul Governor Vasip Sahin said on Twitter that no one was hurt at the police HQ attack and an operation was under way to catch the attackers.
AK Party Provincial head Selim Temurci said on Twitter that there were no injuries in the attack on the party's office.
Later, speaking to reporters, Temurci said the rocket pierced the wall of the building but did not explode, and pointed to the involvement of ultra-left Revolutionary People's Liberation Party-Front (DHKP-C).
He said two assailants were involved in the attack.
Earlier, Prime Minister Binali Yildirim said that terror groups carried out the attack on Istanbul police headquarters.
President Recep Tayyip Erdogan was briefed by Temurci and the governor.
A group of unidentified assailants fired a grenade launcher rocket at an office of Turkey's ruling Justice and Development Party (AKP) in Istanbul on Friday, local media reported.
No casualties have been reported so far, according to NTV television, APA reports.
The Istanbul Police Headquarters in Istanbul became target of a similar attack earlier on Friday, but the rocket reportedly hit a wall without injuring anyone.
Police have launched a wide-scale search for the perpetrators of the attacks, NTV said.